What structures are formed when water molecules surrounds individual ions

Cations (positively charged ions) are surrounded by the negative dipole of the water molecule and the anions (negatively charged ions) are surrounded by the positive dipole of the water molecule. A lattice structure is formed when water molecules surrounds individual ions.

They form cations.

Explanation:

For example, cations such as Na +, K +, or Mg ++ surround themselves with the water molecules with which they bind through dipole interactions; the oxygen atoms in the water molecule are oriented towards the cation. Other cations like Fe3 + bind to 6 water molecules through very strong bonds.

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